稀磁合金中的反常霍尔效应

Extraordinary Hall Effect for Dilute Magnetic Alloys

由电子非对称散射所引起的反常霍尔效应是电子在稀磁合金材料中的重要输运特性．从通常的单杂质、无限大Ｕ安德逊模型入手并对其进行了势附加项的修正．通过使用格林函数费曼图非交叉近似方法（ＮＣＡ），对低温、低磁场中的玻尔兹曼输运方程进行运算，并选用了适当的尝试波函数．在非对称散射跃迁几率计算中，采用杂质格林函数变分及低阶场近似．所得到的计算结果定性地符合相关材料的实验结果．

The extraordinary Hall effect due to the skew scattering is the characteristic of electrons in dilute magnetic alloys. An extended single impurity infiniteU(Intraatomic coulomb interaction)Anderson Model was used, and a firstorder field approximation was performed for a small applied magnetic field. Within the approximation the extraordinary Hall coefficient was calculated using the noncrossing approximation at the low temperature. The numerical results are in qualitative agreement with the experimental results, which account for the main features of the Hall effect in dilute magnetic alloys.